基于FPGA的多道脉冲幅度分析器设计终稿.docVIP

基于FPGA的多道脉冲幅度分析器的设计 摘 要 本次设计将介绍一种采用二级线性放电法构成的可存储多道脉冲幅度分析器的设计系统，其控制与转换的核心采用Altera公司的FPGA：Cyclone的EP1C6Q240C8，并用超高速硬件描述语言VHDL进行程序设计。系统采用USB接口芯片实现与PC的高速数据传输。本次所设计的多道脉冲幅度分析器实现了对随机核辐射信号幅度及密度的测量，即实现了对能量谱的测量。 在本次设计中利用FPGA内部的锁相环（PL）将100MHz的外频倍频到200MHz，并以此作为ADC的计数脉冲，提高了脉冲幅度的转换精度。同时利用芯片Cyclone自带的BLOCK RAM存储道地址数据，增大分析器的存储能力，减少了系统的体积；用FPGA构成USB控制器，实现与USB接口通信的功能；采用二级恒流源线性放电法，提高了系统的ADC的道宽均衡性，同时减少了系统的死时间。最后通过QuartusII软件对设计的系统进行了功能仿真，并下载到试验箱上进行测试， 关键词：多道脉冲幅度分析器， 二级线性放电法， 现场可编程门阵列（FPGA）， 超高速硬件描述语言（VHDL）， 通用串行总线（USB） Design of Multichannel Pulse Amplitude Analyzer Based on FPGA Abstract This design will be designed to introduce a adopt two-stage method of linear discharge pulse width height analyzer design system, the core of the conversion and control unit is achieved in the Cyclone EP1C6Q240C8 of Altera corporation by programming with the VHDL .The transport of the data to PC adopts the port chip of USB. The design of multi-channel pulse amplitude analyzer realized with random signal amplitude and density of math-model of measurement, namely, realize the energy spectrum measurement. In this design, using the FPGA internal phase lock loop (PLL) will 100MHz outside frequency harmonics to 200MHz and regard it as the ADC counting pulse and improve the precision of the pulse amplitude conversion. At the same time use to bring a Cyclone chip which ways address data, RAM storage increases analyzer, reducing the storage capability; the volume system using the FPGA constitute a USB controller with USB communication, realizing the function; Adopt two-stage constant-current source method of linear discharge and improves the system ADC word wide balance of the system, as well as reduce dead time. Finally, through the system QuartusII software to design functions, and the download to simulation test box .however ,because of myself inadequate ,only the software block is successful . Keywords: Multi-channel pulse amplitude analyzer, Two step linearity discharge, FPGA, VHDL, USB 目 录 前 言 1 第